期刊
PHYSICAL REVIEW LETTERS
卷 84, 期 18, 页码 4160-4163出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.84.4160
关键词
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3D computer simulations and experiments are employed to study random packings of compressible spherical grains under external confining stress. In the rigid ball limit, we find a continuous transition in which the stress vanishes as (phi - phi(c))(beta), where phi is the (solid phase) volume density. Thr value of phi(c) depends on whether the grains interact via only normal forces (giving rise to random close packings) or by a combination of normal and friction generated transverse forces (producing random loose packings). In both cases, near the transition, the system's response is controlled by localized force chains.
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